On Fri, May 11, 2018 at 08:19:29PM +0530, Rajesh Yadav wrote:
> SoCs containing dpu have a MDSS top level wrapper
> which includes sub-blocks as dpu, dsi, phy, dp etc.
> MDSS top level wrapper manages common resources like
> common clocks, power and irq for its sub-blocks.
>
> Currently, in dpu driver, all the power resource
> management is part of power_handle which manages
> these resources via a custom implementation. And
> the resource relationships are not modelled properly
> in dt. Moreover the irq domain handling code is part
> of dpu device (which is a child device) due to lack
> of a dedicated driver for MDSS top level wrapper
> device.
>
> This change adds dpu_mdss top level driver to handle
> common clock like - core clock, ahb clock
> (for register access), main power supply (i.e. gdsc)
> and irq management.
> The top level mdss device/driver acts as an interrupt
> controller and manage hwirq mapping for its child
> devices.
>
> It implements runtime_pm support for resource management.
> Child nodes can control these resources via runtime_pm
> get/put calls on their corresponding devices due to parent
> child relationship defined in dt.
>
> Changes in v2:
> - merge _dpu_mdss_hw_rev_init to dpu_mdss_init (Sean Paul)
> - merge _dpu_mdss_get_intr_sources to dpu_mdss_irq (Sean Paul)
> - fix indentation for irq_find_mapping call (Sean Paul)
> - remove unnecessary goto statements from dpu_mdss_irq (Sean Paul)
> - remove redundant param checks from
> dpu_mdss_irq_mask/unmask (Sean Paul/Jordan Crouse)
> - remove redundant param checks from
> dpu_mdss_irqdomain_map (Sean Paul/Jordan Crouse)
> - return error code from dpu_mdss_enable/disable (Sean Paul/Jordan Crouse)
> - remove redundant param check from dpu_mdss_destroy (Sean Paul)
> - remove explicit calls to devm_kfree (Sean Paul/Jordan Crouse)
> - remove compatibility check from dpu_mdss_init as
> it is conditionally called from msm_drv (Sean Paul)
> - reworked msm_dss_parse_clock() to add return checks for
> of_property_read_* calls, fix log message and
> fix alignment issues (Sean Paul/Jordan Crouse)
> - remove extra line before dpu_mdss_init (Sean Paul)
> - remove redundant param checks from __intr_offset and
> make it a void function to avoid unnecessary error
> handling from caller (Jordan Crouse)
> - remove redundant param check from dpu_mdss_irq (Jordan Crouse)
> - change mdss address space log message to debug and use %pK for
> kernel pointers (Jordan Crouse)
> - remove unnecessary log message from msm_dss_parse_clock (Jordan Crouse)
> - don't export msm_dss_parse_clock since it is used
> only by dpu driver (Jordan Crouse)
>
> Signed-off-by: Rajesh Yadav <ryadav@xxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/msm/Makefile | 1 +
> drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c | 97 ---------
> drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.h | 14 --
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c | 9 -
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 7 -
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c | 28 +--
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h | 11 -
> drivers/gpu/drm/msm/disp/dpu1/dpu_irq.c | 48 +---
> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 6 -
> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 2 -
> drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 254 ++++++++++++++++++++++
> drivers/gpu/drm/msm/dpu_io_util.c | 57 +++++
> drivers/gpu/drm/msm/msm_drv.c | 26 ++-
> drivers/gpu/drm/msm/msm_drv.h | 2 +-
> drivers/gpu/drm/msm/msm_kms.h | 1 +
> include/linux/dpu_io_util.h | 2 +
> 16 files changed, 339 insertions(+), 226 deletions(-)
> create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
>
/snip
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
> new file mode 100644
> index 0000000..ce680ea
> --- /dev/null
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
/snip
> +
> +int dpu_mdss_init(struct drm_device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev->dev);
> + struct msm_drm_private *priv = dev->dev_private;
> + struct dpu_mdss *dpu_mdss;
> + struct dss_module_power *mp;
> + int ret = 0;
> +
> + dpu_mdss = devm_kzalloc(dev->dev, sizeof(*dpu_mdss), GFP_KERNEL);
> + if (!dpu_mdss)
> + return -ENOMEM;
> +
> + dpu_mdss->mmio = msm_ioremap(pdev, "mdss_phys", "mdss_phys");
> + if (IS_ERR(dpu_mdss->mmio)) {
> + ret = PTR_ERR(dpu_mdss->mmio);
remove this ...
> + DPU_ERROR("mdss register memory map failed: %d\n", ret);
> + dpu_mdss->mmio = NULL;
> + return ret;
... and replace with
return PTR_ERR(dpu_mdss->mmio);
> + }
> + DRM_DEBUG("mapped mdss address space @%pK\n", dpu_mdss->mmio);
> + dpu_mdss->mmio_len = msm_iomap_size(pdev, "mdss_phys");
> +
> + mp = &dpu_mdss->mp;
> + ret = msm_dss_parse_clock(pdev, mp);
> + if (ret) {
> + DPU_ERROR("failed to parse clocks, ret=%d\n", ret);
> + goto clk_parse_err;
> + }
> +
> + ret = msm_dss_get_clk(&pdev->dev, mp->clk_config, mp->num_clk);
> + if (ret) {
> + DPU_ERROR("failed to get clocks, ret=%d\n", ret);
> + goto clk_get_error;
> + }
> +
> + ret = msm_dss_clk_set_rate(mp->clk_config, mp->num_clk);
> + if (ret) {
> + DPU_ERROR("failed to set clock rate, ret=%d\n", ret);
> + goto clk_rate_error;
> + }
> +
> + dpu_mdss->base.dev = dev;
> + dpu_mdss->base.funcs = &mdss_funcs;
> +
> + ret = _dpu_mdss_irq_domain_add(dpu_mdss);
> + if (ret)
> + goto irq_domain_error;
> +
> + ret = devm_request_irq(dev->dev, platform_get_irq(pdev, 0),
> + dpu_mdss_irq, 0, "dpu_mdss_isr", dpu_mdss);
> + if (ret) {
> + DPU_ERROR("failed to init irq: %d\n", ret);
> + goto irq_error;
> + }
> +
> + pm_runtime_enable(dev->dev);
> +
> + pm_runtime_get_sync(dev->dev);
> + dpu_mdss->hwversion = readl_relaxed(dpu_mdss->mmio);
> + pm_runtime_put_sync(dev->dev);
> +
> + priv->mdss = &dpu_mdss->base;
> +
> + return ret;
> +
> +irq_error:
> + _dpu_mdss_irq_domain_fini(dpu_mdss);
> +irq_domain_error:
> +clk_rate_error:
> + msm_dss_put_clk(mp->clk_config, mp->num_clk);
> +clk_get_error:
> + devm_kfree(&pdev->dev, mp->clk_config);
> +clk_parse_err:
> + if (dpu_mdss->mmio)
> + msm_iounmap(pdev, dpu_mdss->mmio);
> + dpu_mdss->mmio = NULL;
> + return ret;
> +}
> diff --git a/drivers/gpu/drm/msm/dpu_io_util.c b/drivers/gpu/drm/msm/dpu_io_util.c
> index a18bc99..c44f33f 100644
> --- a/drivers/gpu/drm/msm/dpu_io_util.c
> +++ b/drivers/gpu/drm/msm/dpu_io_util.c
> @@ -448,6 +448,63 @@ int msm_dss_enable_clk(struct dss_clk *clk_arry, int num_clk, int enable)
> } /* msm_dss_enable_clk */
> EXPORT_SYMBOL(msm_dss_enable_clk);
>
> +int msm_dss_parse_clock(struct platform_device *pdev,
> + struct dss_module_power *mp)
> +{
> + u32 i, rc = 0;
> + const char *clock_name;
> + u32 rate = 0, max_rate = 0;
> + int num_clk = 0;
> +
> + if (!pdev || !mp)
> + return -EINVAL;
> +
> + mp->num_clk = 0;
> + num_clk = of_property_count_strings(pdev->dev.of_node, "clock-names");
> + if (num_clk <= 0) {
> + pr_debug("clocks are not defined\n");
> + return 0;
> + }
> +
> + mp->clk_config = devm_kzalloc(&pdev->dev,
> + sizeof(struct dss_clk) * num_clk,
> + GFP_KERNEL);
> + if (!mp->clk_config)
> + return -ENOMEM;
> +
> + for (i = 0; i < num_clk; i++) {
> + rc = of_property_read_string_index(pdev->dev.of_node,
> + "clock-names", i,
> + &clock_name);
> + if (rc)
> + break;
> + strlcpy(mp->clk_config[i].clk_name, clock_name,
> + sizeof(mp->clk_config[i].clk_name));
> +
> + rc = of_property_read_u32_index(pdev->dev.of_node,
> + "clock-rate", i,
> + &rate);
> + if (rc)
> + break;
> + mp->clk_config[i].rate = rate;
> + if (!mp->clk_config[i].rate)
> + mp->clk_config[i].type = DSS_CLK_AHB;
> + else
> + mp->clk_config[i].type = DSS_CLK_PCLK;
> +
> + rc = of_property_read_u32_index(pdev->dev.of_node,
> + "clock-max-rate", i,
> + &max_rate);
Hmm, I missed these in my first review, these need new dt bindings. I'm
far from an expert on dt bindings, but I think you'll be asked to define these
are clocks, and get the rate/max rate information from the clock subsystem
instead of breaking it all out like this.
Sean
> + if (rc)
> + break;
> + mp->clk_config[i].max_rate = max_rate;
> + }
> +
> + if (!rc)
> + mp->num_clk = num_clk;
> +
> + return rc;
> +}
>
> int dpu_i2c_byte_read(struct i2c_client *client, uint8_t slave_addr,
> uint8_t reg_offset, uint8_t *read_buf)
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 5d8f1b6..a0e73ea 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -503,7 +503,18 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
> ddev->dev_private = priv;
> priv->dev = ddev;
>
> - ret = mdp5_mdss_init(ddev);
> + switch (get_mdp_ver(pdev)) {
> + case KMS_MDP5:
> + ret = mdp5_mdss_init(ddev);
> + break;
> + case KMS_DPU:
> + ret = dpu_mdss_init(ddev);
> + break;
> + default:
> + ret = 0;
> + break;
> + }
> +
> if (ret)
> goto mdss_init_fail;
>
> @@ -1539,12 +1550,13 @@ static int add_display_components(struct device *dev,
> int ret;
>
> /*
> - * MDP5 based devices don't have a flat hierarchy. There is a top level
> - * parent: MDSS, and children: MDP5, DSI, HDMI, eDP etc. Populate the
> - * children devices, find the MDP5 node, and then add the interfaces
> - * to our components list.
> + * MDP5/DPU based devices don't have a flat hierarchy. There is a top
> + * level parent: MDSS, and children: MDP5/DPU, DSI, HDMI, eDP etc.
> + * Populate the children devices, find the MDP5/DPU node, and then add
> + * the interfaces to our components list.
> */
> - if (of_device_is_compatible(dev->of_node, "qcom,mdss")) {
> + if (of_device_is_compatible(dev->of_node, "qcom,mdss") ||
> + of_device_is_compatible(dev->of_node, "qcom,dpu-mdss")) {
> ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
> if (ret) {
> dev_err(dev, "failed to populate children devices\n");
> @@ -1686,7 +1698,7 @@ static int msm_pdev_remove(struct platform_device *pdev)
> { .compatible = "qcom,mdp4", .data = (void *)KMS_MDP4 },
> { .compatible = "qcom,mdss", .data = (void *)KMS_MDP5 },
> #ifdef CONFIG_DRM_MSM_DPU
> - { .compatible = "qcom,dpu-kms", .data = (void *)KMS_DPU },
> + { .compatible = "qcom,dpu-mdss", .data = (void *)KMS_DPU },
> #endif
> {}
> };
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index 90a2521..e8e5e73 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -381,7 +381,7 @@ struct msm_drm_private {
> /* subordinate devices, if present: */
> struct platform_device *gpu_pdev;
>
> - /* top level MDSS wrapper device (for MDP5 only) */
> + /* top level MDSS wrapper device (for MDP5/DPU only) */
> struct msm_mdss *mdss;
>
> /* possibly this should be in the kms component, but it is
> diff --git a/drivers/gpu/drm/msm/msm_kms.h b/drivers/gpu/drm/msm/msm_kms.h
> index 9a7bc7d..5e1de85 100644
> --- a/drivers/gpu/drm/msm/msm_kms.h
> +++ b/drivers/gpu/drm/msm/msm_kms.h
> @@ -144,6 +144,7 @@ struct msm_mdss {
> };
>
> int mdp5_mdss_init(struct drm_device *dev);
> +int dpu_mdss_init(struct drm_device *dev);
>
> /**
> * Mode Set Utility Functions
> diff --git a/include/linux/dpu_io_util.h b/include/linux/dpu_io_util.h
> index 7c73899..45e606f 100644
> --- a/include/linux/dpu_io_util.h
> +++ b/include/linux/dpu_io_util.h
> @@ -104,6 +104,8 @@ int msm_dss_config_vreg(struct device *dev, struct dss_vreg *in_vreg,
> void msm_dss_put_clk(struct dss_clk *clk_arry, int num_clk);
> int msm_dss_clk_set_rate(struct dss_clk *clk_arry, int num_clk);
> int msm_dss_enable_clk(struct dss_clk *clk_arry, int num_clk, int enable);
> +int msm_dss_parse_clock(struct platform_device *pdev,
> + struct dss_module_power *mp);
>
> int dpu_i2c_byte_read(struct i2c_client *client, uint8_t slave_addr,
> uint8_t reg_offset, uint8_t *read_buf);
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
--
Sean Paul, Software Engineer, Google / Chromium OS
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